CN113921988A - Battery diaphragm coating material and preparation method thereof, battery diaphragm and battery - Google Patents
Battery diaphragm coating material and preparation method thereof, battery diaphragm and battery Download PDFInfo
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- CN113921988A CN113921988A CN202111057566.4A CN202111057566A CN113921988A CN 113921988 A CN113921988 A CN 113921988A CN 202111057566 A CN202111057566 A CN 202111057566A CN 113921988 A CN113921988 A CN 113921988A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/443—Particulate material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- H01M50/491—Porosity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The application discloses battery diaphragm coating material and preparation method, battery diaphragm and battery thereof, and this battery diaphragm coating material includes binder and filling porous material, filling porous material includes porous carbon with pore structure and fills in filler particle in the pore structure, the filler particle is used for promoting lithium ion migration. The porous structure of the porous carbon can build a bridge for lithium ions to rapidly migrate, so that the lithium ions can migrate in the porous structure of the porous carbon. Meanwhile, the filling particles are filled in the pore channel structure of the porous carbon, the filling particles can further promote lithium ion migration, so that the formed battery diaphragm coating material has high ionic conductivity, the used porous carbon has high specific surface area, space can be provided for electrolyte accumulation subsequently, and the liquid retention rate of the prepared battery diaphragm can be improved.
Description
Technical Field
The application relates to the technical field of battery diaphragms, in particular to a battery diaphragm coating material and a preparation method thereof, a battery diaphragm and a battery.
Background
In recent years, with the development of national economy and social progress, energy problems and environmental problems have become concerns of countries around the world. The excessive consumption of fossil fuels and the further increase of energy demand have driven the development and utilization of clean energy.
Lithium ion secondary batteries are the preferred power source in the fields of digital products, electric automobile products and the like at present due to high energy density, high working voltage and long cycle life. The diaphragm is used as an important component of the lithium ion battery, the cost and the service performance of the battery are directly influenced, the diaphragm mainly has the function of separating a positive electrode from a negative electrode and preventing the two electrodes from being contacted to cause short circuit, the diaphragm material needs to be conductive but not conductive, and the lithium battery diaphragm material which is commercially applied at present mainly is a polyolefin material and mainly comprises PE (polyethylene) and PP (polypropylene).
In the lithium ion battery, the electrolyte is an organic solvent system, so that the separator material needs to resist the corrosion of the organic solvent and has sufficient chemical and electrochemical stability. Although the performance of the current lithium battery diaphragm material is improved through a plurality of preparation technology improvements and coating modification, the diaphragm used in the current market still has the problem of low ionic conductivity.
Disclosure of Invention
The present application is directed to solving at least one of the problems in the prior art. Therefore, the application provides a battery diaphragm coating material, a preparation method thereof and a battery diaphragm, and the battery diaphragm prepared from the battery diaphragm coating material has high ionic conductivity and electrolyte retention rate.
In a first aspect of the present application, a battery separator coating material is provided, comprising a filler porous material including porous carbon having a pore structure and filler particles filled in the pore structure, the filler particles being configured to promote lithium ion migration.
The battery separator coating material according to the embodiment of the application has at least the following beneficial effects:
the battery separator coating material provided by the embodiment of the application comprises a filling porous material, wherein the filling porous material comprises porous carbon with a pore channel structure and filling particles filled in the pore channel structure. The porous structure of the porous carbon can build a bridge for lithium ions to rapidly migrate, so that the lithium ions can migrate in the porous structure of the porous carbon. Meanwhile, the filling particles are filled in the pore channel structure of the porous carbon, the filling particles can further promote lithium ion migration, so that the formed battery diaphragm coating material has high ionic conductivity, the used porous carbon has high specific surface area, space can be provided for electrolyte accumulation subsequently, and the liquid retention rate of the prepared battery diaphragm can be improved. In addition, compared with other porous materials, the porous carbon also has good heat conduction and heat dissipation capacity, and the thermal stability of the prepared battery diaphragm can be further improved.
In some embodiments of the present application, the filler particles comprise at least one of a lithium lanthanum zirconium oxide material, a doped lithium lanthanum zirconium oxide material, an alkali metal compound, a nitride. Unlike substances having lithium ion migration ability directly, the filler particles used in the present application have an effect of promoting lithium ion migration, serving as a driving force for lithium ion migration, such as a garnet-type electrolyte made of lithium lanthanum zirconium oxide material, and playing a role of conducting ions; the doped lithium lanthanum zirconium oxide material can be exemplified by a tantalum-doped lithium lanthanum zirconium oxide material capable of increasing the lithium ion transmission rate; the alkali metal compound can be exemplified by nano-sheet lithium titanate, and the two-dimensional sheet nanostructure can effectively shorten the diffusion distance of lithium ions, thereby promoting the rapid migration of the lithium ions; the nitride is exemplified by titanium nitride (TiN), which has an ultra-high metal conductivity to facilitate electron transfer and also to allow lithium ions to rapidly diffuse.
In some embodiments of the present application, the porous carbon includes at least one of carbon nanotubes, mesoporous carbon, activated carbon, porous graphene. These porous carbon materials have the tubular pore structure and the high specific surface area of fixed aperture, the tubular pore structure of fixed aperture can hold the filler particle, high specific surface area can adsorb electrolyte and make electrolyte can gather inside battery diaphragm coating, promote through filler particle wherein, guarantee lithium ion's quick migration, improve the imbibition and the liquid retention ability of battery diaphragm coating, can also reduce the interface impedance of electrode and diaphragm simultaneously, in addition, porous carbon material can also make the diaphragm have better heat conduction and heat-sinking capability, promote diaphragm thermal stability.
In some embodiments of the present application, the mass ratio of the porous carbon and the filler particles is (5-60): (95-40). The filling particles entering the pore channels of the porous carbon have the effect of further promoting lithium ion migration, the number of the pore channels of the porous carbon is certain when the using amount of the porous carbon is fixed, the filling particles with proper amount can be controlled to enter the pore channels of the porous carbon by controlling the adding proportion of the porous carbon and the filling particles, and the utilization efficiency of the filling particles is improved.
In some embodiments of the present application, the battery separator coating material further comprises a binder, the binder being a polyvinylidene fluoride-based binder. Polyvinylidene fluoride-based binders are exemplified by polyvinylidene fluoride (PVDF) or polyvinylidene fluoride copolymers. The used binder can promote the dissociation of lithium salt in the electrolyte through interaction in the electrochemical process, improve the migration rate of lithium ions in the electrolyte and improve the ionic conductivity of the electrolyte.
In some embodiments of the present application, the ratio of the mass of the binder to the mass of the filled porous material is 0.5 to 10%. The addition amount of the binder is controlled within a reasonable range, and the addition amount of the filling porous material can be increased on the premise of ensuring the binding performance of the coating material.
In some embodiments of the present application, the ratio of the particle size of the filler particles to the pore size of the channel structure is 1: (2-5). The too large particle size of the filler particles is not favorable for the filler particles to effectively enter the pore channels, and the too small particle size of the filler particles cannot effectively achieve the effect of promoting the migration of lithium ions.
In a second aspect of the application, a preparation method of the battery separator coating material is provided, which comprises the following steps:
taking porous carbon, filler particles and a solvent, grinding, and then carrying out a heating reaction, wherein the temperature of the heating reaction is not lower than the boiling point of the solvent;
and (4) separating solid from liquid, and taking the solid to obtain the battery diaphragm coating material.
The preparation method of the battery separator coating material according to the embodiment of the application has at least the following beneficial effects:
the application provides a preparation method of battery diaphragm coating material, the mode that utilizes to grind is with porous carbon and filler particle misce bene, and combine the heating reaction, make solvent molecule maintain at high-efficient motion state, drive filler particle wherein, can realize the effect in the pore of filler particle fully entering porous carbon, and adopt mixed modes such as mechanical stirring then can't realize the effect in filler particle entering pore, this application is through filling filler particle to pore in, utilize the pore to fill the particle and further promote lithium ion migration, the coating material that the preparation obtained can promote the ionic conductivity of battery diaphragm.
In some embodiments of the present application, the temperature of the heating reaction is 100 to 150 ℃. When a solvent such as water is used for mixing, the temperature of the heating reaction is controlled to be higher than the boiling point of water, so that the filler particles can be well promoted to enter the pore channels of the porous carbon.
In a third aspect of the application, a battery diaphragm is provided, which comprises a diaphragm base film and a coating material coated on the diaphragm base film, wherein the coating material is the battery diaphragm coating material or the battery diaphragm coating material prepared by the preparation method.
Separator-based membranes are commonly used separator materials, including but not limited to porous polyolefin materials. The porous polyolefin material may be exemplified by polyethylene, polypropylene, and the like. The used porous polyolefin material has a porous structure and can absorb and retain electrolyte, so that ion conduction is realized, and the ion conductivity of the prepared battery is improved.
In some embodiments of the present application, the coating layer formed of the coating material has a thickness of 0.1 to 10 μm. The coating with the thickness effectively improves the ionic conductivity of the diaphragm while forming good supporting capacity, so that the diaphragm has better electrolyte wettability and liquid retention capacity, and the electrical property of the lithium battery is improved.
In some embodiments of the present application, the coating material covers both sides of the separator base film. The coating effect of the coating material can be improved by adopting double-sided coating, and the ionic conductivity, the liquid retention rate and other properties of the prepared battery diaphragm are further improved. The coating has good structural support capacity, so that the interlayer diaphragm base film is closed at high temperature, the smaller thermal shrinkage of the coating diaphragm is ensured, and the safety performance of the lithium battery is effectively improved.
In a fourth aspect of the present application, a battery is provided, which is characterized by comprising the above battery separator. As a typical battery structure, a battery can be formed using an assembly of a positive electrode tab, a battery separator, and a negative electrode tab. In some embodiments, the battery is a lithium ion battery.
Drawings
The present application is further described with reference to the following figures and examples, in which:
FIG. 1 is a schematic structural view of a battery separator prepared in example 1 of the present application;
FIG. 2 is a transmission electron micrograph of a filled porous material prepared in example 1 of the present application;
FIG. 3 is an enlarged view of a TEM image of the porous material of FIG. 2;
FIG. 4 is a transmission electron micrograph of the composite obtained in comparative example 1 by means of mechanical stirring.
Detailed Description
The conception and the resulting technical effects of the present application will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive efforts based on the embodiments of the present application belong to the protection scope of the present application.
Example 1
This example provides a battery separator prepared according to the following steps:
(1) mixing 30 parts by mass of carbon nano tube and 70 parts by mass of lithium lanthanum zirconium oxide to form a mixture, wherein the ratio of the particle size of the lithium lanthanum zirconium oxide material to the aperture of the carbon nano tube is 1: 3 (the ratio of the particle size to the pore diameter is 1: 3 for short), adding 100 parts by mass of solvent deionized water into the mixture, fully grinding to obtain viscous slurry, transferring the slurry into a three-neck flask, adding 2000 parts by mass of deionized water again, connecting a condensate water device, heating by adopting an oil bath, and performing heating reflux reaction at 125 ℃ by matching with mechanical stirring, wherein the reaction time is 2 hours.
(2) And (3) centrifugally separating the reacted dispersion liquid, performing suction filtration, performing vacuum drying in a vacuum drying oven for 48 hours at the drying temperature of 40 ℃ after the suction filtration is finished, and grinding to obtain the filling porous material. Then, the filling porous material and 2 parts by mass of polyvinylidene fluoride as a binder are added into a solvent to prepare coating slurry.
(3) And (3) coating the coating slurry prepared in the step (2) on two sides of a polyethylene base film, wherein the thickness of the polyethylene base film is 5 micrometers, and the coating thickness of the coating slurry is 5 micrometers, and then drying at the temperature of 60 ℃ to prepare the battery diaphragm.
Fig. 1 shows a schematic structural diagram of a battery separator prepared, filling particles enter the pore channels of porous carbon to form a filling porous material, and a coating material formed by mixing with a binder is uniformly coated on two sides of a separator base membrane.
Fig. 2 shows a transmission electron microscope image of the filled porous material prepared in step (2), and it can be seen from the image that in the embodiment of the present application, the lithium lanthanum zirconium oxide material can sufficiently enter the pore channels of the carbon nanotube by a dispersion manner combining the mechanical grinding and the heating reflow manner. Fig. 3 shows an enlarged view of the tem image of the filled porous material of fig. 2, from which it can be seen that the li-la-zr-o material is dispersed at different locations in the cell channels.
Examples 2 to 13
Examples 2-13 each provide a battery separator prepared according to the same procedure as in example 1, except that the formulation shown in table 1 was used.
Table 1 compositions of formulations for battery separators in examples 1-13
Wherein, the solvent used in the preparation process of the embodiment 8 is absolute ethyl alcohol, and the solvent used in the embodiment 9 is diethyl ether.
Effect example 1
Comparative example 1: comparative example 1 provides a battery separator, except that step (1) adopts a mechanical stirring mode to mix the mixture with deionized water to obtain a slurry, and the specific preparation process is as follows:
(1) mixing 30 parts by mass of carbon nano tube and 70 parts by mass of lithium lanthanum zirconium oxide to form a mixture, wherein the ratio of the particle size of the lithium lanthanum zirconium oxide material to the aperture of the carbon nano tube is 1: 3 (the ratio of the particle diameter to the pore diameter is 1: 3 for short), then mechanically stirring to obtain a mixture, and adding the mixture and 2 parts by mass of a binder polyvinylidene fluoride into a solvent to prepare coating slurry.
(2) And (2) coating the coating slurry prepared in the step (1) on the surface of a polyethylene base film, wherein the thickness of the polyethylene base film is 5 microns, and the coating thickness of the coating slurry is 5 microns, and then drying at the temperature of 60 ℃ to prepare the battery diaphragm.
Comparative example 2: comparative example 2 provides a battery separator, which is a polyethylene-based film 5 μm thick, with no coating paste applied to the surface.
Fig. 4 shows a transmission electron microscope image of the mixture prepared in the comparative example 1, and it is seen from the image that the lithium lanthanum zirconium oxygen particles in the mixture obtained in the comparative example 1 by mechanical stirring treatment do not enter the pore channels of the carbon nanotubes, but are dispersed around the carbon nanotubes, and the experimental result shows that the effect of filling the particles into the pore channels of the porous carbon cannot be achieved by directly adopting the mechanical stirring manner.
And (3) performance testing: symmetric batteries were prepared from the battery separators prepared in examples 1 to 13, comparative example 1 and comparative example 2, respectively, and the specific preparation process was: using copper foil as an electrode, using a conventional lithium ion battery electrolyte (1M lithium hexafluorophosphate as a lithium salt, ethylene carbonate EC, dimethyl carbonate DMC and ethyl methyl carbonate EMC mixed in a volume ratio of 1:1:1 as solvents) as a symmetrical battery electrolyte, and then assembling batteries using the battery separators prepared in examples 1 to 13, comparative example 1 and comparative example 2, respectively, as separators, the ionic conductivity of the battery separators was calculated by testing the electrochemical impedance of the symmetrical batteries, and the results are shown in table 2. The battery separators prepared in examples 1 to 13, comparative example 1 and comparative example 2 were respectively subjected to a liquid retention test by the following method: the prepared battery separator was punched into a certain size and weighed, was taken out after being sufficiently soaked in the above-mentioned symmetrical battery electrolyte, the surface electrolyte was wiped off and weighed again, and the liquid retention amount and the liquid retention rate were calculated, and the results are shown in table 2. The battery separators prepared in examples 1 to 13, comparative example 1 and comparative example 2 were simultaneously punched out to a fixed size (100mm × 50mm) to be subjected to a heat shrinkage test, and the heat shrinkage rate (MD) and Transverse Direction (TD) of the battery separator were measured for 1 hour at 100 c and 0.5 hour at 150 c, respectively, and the results are shown in table 2.
Table 2 performance parameters of the battery separators of examples 1-13 and comparative examples 1, 2 and the batteries formed
It can be seen from table 2 that, compared with the mode of mechanical stirring in comparative example 1, the ionic conductivity of the battery separator prepared by the dispersion mode in example 1 of the present application is significantly improved, because the coating material prepared by the example of the present application can build a bridge for lithium ions to rapidly migrate, and the dispersion mode can enable the lithium lanthanum zirconium oxide material to be filled into the pore channel of the carbon nanotube, the lithium lanthanum zirconium oxide material in the pore channel can further promote the migration of lithium ions, so that the battery separator formed by preparation has higher ionic conductivity, and the mode of mechanical stirring in comparative example 1 cannot achieve the effect of filling the lithium lanthanum zirconium oxide material into the pore channel of the carbon nanotube, so the ionic conductivity of the battery separator is lower. The ionic conductivity of the battery separator films of examples 1-13 was higher than that of comparative examples 1 and 2, compared to comparative examples 1 and 2, and the results show that the coating slurry obtained by grinding treatment applied on the separator base film of the example of the present application can improve the electronic conductivity of the battery separator film better than the battery separator film obtained by mechanical stirring and without applying the coating material of the present application.
In addition, the liquid retention rate of the battery separator provided in examples 1 to 13 of the present application is significantly improved compared to the polyethylene-based film without the coating material applied thereto in comparative example 2, because porous carbon having a high specific surface area is used in the coating material applied to the battery separator, and the porous carbon material can provide a space for electrolyte accumulation, improve the electrolyte-phobic property of the surface of the battery separator, and thus the liquid retention rate of the prepared battery separator is significantly improved. As can be seen from comparison between examples 1 to 13 and comparative example 2, the battery separators of examples 1 to 13 of the present application have significantly reduced shrinkage rates at 100 ℃ and 130 ℃ and improved thermal shrinkage properties and thermal stability, compared to the battery separator of comparative example 2, in which the coating material is not coated, mainly because the porous carbon material used has good thermal conductivity and thermal dissipation properties, and the coated coating material also has excellent support ability, so that the prepared battery separator has good thermal shrinkage stability.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application.
Claims (10)
1. A battery separator coating material comprising a filled porous material comprising porous carbon having a pore structure and filler particles filled in the pore structure to promote lithium ion migration.
2. The battery separator coating material of claim 1, wherein the filler particles comprise at least one of a lithium lanthanum zirconium oxide material, a doped lithium lanthanum zirconium oxide material, an alkali metal compound, a nitride.
3. The battery separator coating material of claim 1, wherein the porous carbon comprises at least one of carbon nanotubes, mesoporous carbon, activated carbon, porous graphene.
4. The battery separator coating material according to claim 1, wherein the mass ratio of the porous carbon to the filler particles is (5-60): (95-40).
5. The battery separator coating material according to any one of claims 1 to 4, further comprising a binder, wherein the ratio of the mass of the binder to the mass of the filled porous material is 0.5 to 10%.
6. The battery separator coating material according to any one of claims 1 to 4, wherein the ratio of the particle size of the filler particles to the pore size of the pore channel structure is 1: (2-5).
7. The method for preparing a battery separator coating material according to any one of claims 1 to 4, comprising the steps of:
taking porous carbon, filler particles and a solvent, grinding, and then carrying out a heating reaction, wherein the temperature of the heating reaction is not lower than the boiling point of the solvent;
and (4) separating solid from liquid, and taking the solid to obtain the battery diaphragm coating material.
8. The preparation method of the battery separator coating material according to claim 7, wherein the temperature of the heating reaction is 100-150 ℃.
9. A battery separator comprising a separator base film and a coating material coated on the separator base film, wherein the coating material is the battery separator coating material according to any one of claims 1 to 6 or the battery separator coating material produced by the production method according to any one of claims 7 to 8.
10. A battery comprising the battery separator of claim 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116169434A (en) * | 2023-04-23 | 2023-05-26 | 宁德新能源科技有限公司 | Separator, electrochemical device and electronic device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116169434A (en) * | 2023-04-23 | 2023-05-26 | 宁德新能源科技有限公司 | Separator, electrochemical device and electronic device |
| CN116169434B (en) * | 2023-04-23 | 2023-12-22 | 宁德新能源科技有限公司 | Separator, electrochemical device and electronic device |
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